[apple/xnu.git] / osfmk / kern / printf.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */

/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

/*
 *  Common code for printf et al.
 *
 *  The calling routine typically takes a variable number of arguments,
 *  and passes the address of the first one.  This implementation
 *  assumes a straightforward, stack implementation, aligned to the
 *  machine's wordsize.  Increasing addresses are assumed to point to
 *  successive arguments (left-to-right), as is the case for a machine
 *  with a downward-growing stack with arguments pushed right-to-left.
 *
 *  To write, for example, fprintf() using this routine, the code
 *
 *      fprintf(fd, format, args)
 *      FILE *fd;
 *      char *format;
 *      {
 *      _doprnt(format, &args, fd);
 *      }
 *
 *  would suffice.  (This example does not handle the fprintf's "return
 *  value" correctly, but who looks at the return value of fprintf
 *  anyway?)
 *
 *  This version implements the following printf features:
 *
 *      %d      decimal conversion
 *      %u      unsigned conversion
 *      %x      hexadecimal conversion
 *      %X      hexadecimal conversion with capital letters
 *      %o      octal conversion
 *      %c      character
 *      %s      string
 *      %m.n    field width, precision
 *      %-m.n   left adjustment
 *      %0m.n   zero-padding
 *      %*.*    width and precision taken from arguments
 *
 *  This version does not implement %f, %e, or %g.  It accepts, but
 *  ignores, an `l' as in %ld, %lo, %lx, and %lu, and therefore will not
 *  work correctly on machines for which sizeof(long) != sizeof(int).
 *  It does not even parse %D, %O, or %U; you should be using %ld, %o and
 *  %lu if you mean long conversion.
 *
 *  As mentioned, this version does not return any reasonable value.
 *
 *  Permission is granted to use, modify, or propagate this code as
 *  long as this notice is incorporated.
 *
 *  Steve Summit 3/25/87
 */

/*
 * Added formats for decoding device registers:
 *
 * printf("reg = %b", regval, "<base><arg>*")
 *
 * where <base> is the output base expressed as a control character:
 * i.e. '\10' gives octal, '\20' gives hex.  Each <arg> is a sequence of
 * characters, the first of which gives the bit number to be inspected
 * (origin 1), and the rest (up to a control character (<= 32)) give the
 * name of the register.  Thus
 *      printf("reg = %b\n", 3, "\10\2BITTWO\1BITONE")
 * would produce
 *      reg = 3<BITTWO,BITONE>
 *
 * If the second character in <arg> is also a control character, it
 * indicates the last bit of a bit field.  In this case, printf will extract
 * bits <1> to <2> and print it.  Characters following the second control
 * character are printed before the bit field.
 *      printf("reg = %b\n", 0xb, "\10\4\3FIELD1=\2BITTWO\1BITONE")
 * would produce
 *      reg = b<FIELD1=2,BITONE>
 *
 * The %B format is like %b but the bits are numbered from the most
 * significant (the bit weighted 31), which is called 1, to the least
 * significant, called 32.
 */
/*
 * Added for general use:
 *      #       prefix for alternate format:
 *              0x (0X) for hex
 *              leading 0 for octal
 *      +       print '+' if positive
 *      blank   print ' ' if positive
 *
 *      z       signed hexadecimal
 *      r       signed, 'radix'
 *      n       unsigned, 'radix'
 *
 *      D,U,O,Z same as corresponding lower-case versions
 *              (compatibility)
 */

#include <platforms.h>
#include <mach/boolean.h>
#include <cpus.h>
#include <kern/cpu_number.h>
#include <kern/lock.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
#include <kern/misc_protos.h>
#include <stdarg.h>
#include <string.h>
#include <mach_assert.h>
#ifdef  MACH_BSD
#include <sys/msgbuf.h>
#endif

#ifdef __ppc__
#include <ppc/Firmware.h>
#endif

/*
 * Forward declarations
 */
void printnum(
        register unsigned int   u,
        register int            base,
        void                    (*putc)(char));


#define isdigit(d) ((d) >= '0' && (d) <= '9')
#define Ctod(c) ((c) - '0')

#define MAXBUF (sizeof(long int) * 8)            /* enough for binary */

void
printnum(
        register unsigned int   u,              /* number to print */
        register int            base,
        void                    (*putc)(char))
{
        char    buf[MAXBUF];    /* build number here */
        register char * p = &buf[MAXBUF-1];
        static char digs[] = "0123456789abcdef";

        do {
            *p-- = digs[u % base];
            u /= base;
        } while (u != 0);

        while (++p != &buf[MAXBUF])
            (*putc)(*p);

}

boolean_t       _doprnt_truncates = FALSE;

void 
_doprnt(
        register const char     *fmt,
        va_list                 *argp,
                                                /* character output routine */
        void                    (*putc)(char),
        int                     radix)          /* default radix - for '%r' */
{
        int             length;
        int             prec;
        boolean_t       ladjust;
        char            padc;
        long            n;
        unsigned long   u;
        int             plus_sign;
        int             sign_char;
        boolean_t       altfmt, truncate;
        int             base;
        register char   c;
        int             capitals;

        while ((c = *fmt) != '\0') {
            if (c != '%') {
                (*putc)(c);
                fmt++;
                continue;
            }

            fmt++;

            length = 0;
            prec = -1;
            ladjust = FALSE;
            padc = ' ';
            plus_sign = 0;
            sign_char = 0;
            altfmt = FALSE;

            while (TRUE) {
                c = *fmt;
                if (c == '#') {
                    altfmt = TRUE;
                }
                else if (c == '-') {
                    ladjust = TRUE;
                }
                else if (c == '+') {
                    plus_sign = '+';
                }
                else if (c == ' ') {
                    if (plus_sign == 0)
                        plus_sign = ' ';
                }
                else
                    break;
                fmt++;
            }

            if (c == '0') {
                padc = '0';
                c = *++fmt;
            }

            if (isdigit(c)) {
                while(isdigit(c)) {
                    length = 10 * length + Ctod(c);
                    c = *++fmt;
                }
            }
            else if (c == '*') {
                length = va_arg(*argp, int);
                c = *++fmt;
                if (length < 0) {
                    ladjust = !ladjust;
                    length = -length;
                }
            }

            if (c == '.') {
                c = *++fmt;
                if (isdigit(c)) {
                    prec = 0;
                    while(isdigit(c)) {
                        prec = 10 * prec + Ctod(c);
                        c = *++fmt;
                    }
                }
                else if (c == '*') {
                    prec = va_arg(*argp, int);
                    c = *++fmt;
                }
            }

            if (c == 'l')
                c = *++fmt;     /* need it if sizeof(int) < sizeof(long) */

            truncate = FALSE;
            capitals=0;         /* Assume lower case printing */

            switch(c) {
                case 'b':
                case 'B':
                {
                    register char *p;
                    boolean_t     any;
                    register int  i;

                    u = va_arg(*argp, unsigned long);
                    p = va_arg(*argp, char *);
                    base = *p++;
                    printnum(u, base, putc);

                    if (u == 0)
                        break;

                    any = FALSE;
                    while ((i = *p++) != '\0') {
                        if (*fmt == 'B')
                            i = 33 - i;
                        if (*p <= 32) {
                            /*
                             * Bit field
                             */
                            register int j;
                            if (any)
                                (*putc)(',');
                            else {
                                (*putc)('<');
                                any = TRUE;
                            }
                            j = *p++;
                            if (*fmt == 'B')
                                j = 32 - j;
                            for (; (c = *p) > 32; p++)
                                (*putc)(c);
                            printnum((unsigned)( (u>>(j-1)) & ((2<<(i-j))-1)),
                                        base, putc);
                        }
                        else if (u & (1<<(i-1))) {
                            if (any)
                                (*putc)(',');
                            else {
                                (*putc)('<');
                                any = TRUE;
                            }
                            for (; (c = *p) > 32; p++)
                                (*putc)(c);
                        }
                        else {
                            for (; *p > 32; p++)
                                continue;
                        }
                    }
                    if (any)
                        (*putc)('>');
                    break;
                }

                case 'c':
                    c = va_arg(*argp, int);
                    (*putc)(c);
                    break;

                case 's':
                {
                    register char *p;
                    register char *p2;

                    if (prec == -1)
                        prec = 0x7fffffff;      /* MAXINT */

                    p = va_arg(*argp, char *);

                    if (p == (char *)0)
                        p = "";

                    if (length > 0 && !ladjust) {
                        n = 0;
                        p2 = p;

                        for (; *p != '\0' && n < prec; p++)
                            n++;

                        p = p2;

                        while (n < length) {
                            (*putc)(' ');
                            n++;
                        }
                    }

                    n = 0;

                    while (*p != '\0') {
                        if (++n > prec || (length > 0 && n > length))
                            break;

                        (*putc)(*p++);
                    }

                    if (n < length && ladjust) {
                        while (n < length) {
                            (*putc)(' ');
                            n++;
                        }
                    }

                    break;
                }

                case 'o':
                    truncate = _doprnt_truncates;
                case 'O':
                    base = 8;
                    goto print_unsigned;

                case 'd':
                    truncate = _doprnt_truncates;
                case 'D':
                    base = 10;
                    goto print_signed;

                case 'u':
                    truncate = _doprnt_truncates;
                case 'U':
                    base = 10;
                    goto print_unsigned;

                case 'p':
                    altfmt = TRUE;
                case 'x':
                    truncate = _doprnt_truncates;
                    base = 16;
                    goto print_unsigned;

                case 'X':
                    base = 16;
                    capitals=16;        /* Print in upper case */
                    goto print_unsigned;

                case 'z':
                    truncate = _doprnt_truncates;
                    base = 16;
                    goto print_signed;
                        
                case 'Z':
                    base = 16;
                    capitals=16;        /* Print in upper case */
                    goto print_signed;

                case 'r':
                    truncate = _doprnt_truncates;
                case 'R':
                    base = radix;
                    goto print_signed;

                case 'n':
                    truncate = _doprnt_truncates;
                case 'N':
                    base = radix;
                    goto print_unsigned;

                print_signed:
                    n = va_arg(*argp, long);
                    if (n >= 0) {
                        u = n;
                        sign_char = plus_sign;
                    }
                    else {
                        u = -n;
                        sign_char = '-';
                    }
                    goto print_num;

                print_unsigned:
                    u = va_arg(*argp, unsigned long);
                    goto print_num;

                print_num:
                {
                    char        buf[MAXBUF];    /* build number here */
                    register char *     p = &buf[MAXBUF-1];
                    static char digits[] = "0123456789abcdef0123456789ABCDEF";
                    char *prefix = 0;

                    if (truncate) u = (long)((int)(u));

                    if (u != 0 && altfmt) {
                        if (base == 8)
                            prefix = "0";
                        else if (base == 16)
                            prefix = "0x";
                    }

                    do {
                        /* Print in the correct case */
                        *p-- = digits[(u % base)+capitals];
                        u /= base;
                    } while (u != 0);

                    length -= (&buf[MAXBUF-1] - p);
                    if (sign_char)
                        length--;
                    if (prefix)
                        length -= strlen((const char *) prefix);

                    if (padc == ' ' && !ladjust) {
                        /* blank padding goes before prefix */
                        while (--length >= 0)
                            (*putc)(' ');
                    }
                    if (sign_char)
                        (*putc)(sign_char);
                    if (prefix)
                        while (*prefix)
                            (*putc)(*prefix++);
                    if (padc == '0') {
                        /* zero padding goes after sign and prefix */
                        while (--length >= 0)
                            (*putc)('0');
                    }
                    while (++p != &buf[MAXBUF])
                        (*putc)(*p);

                    if (ladjust) {
                        while (--length >= 0)
                            (*putc)(' ');
                    }
                    break;
                }

                case '\0':
                    fmt--;
                    break;

                default:
                    (*putc)(c);
            }
        fmt++;
        }
}

#if     MP_PRINTF 
boolean_t       new_printf_cpu_number = FALSE;
#endif  /* MP_PRINTF */


decl_simple_lock_data(,printf_lock)
decl_mutex_data(,sprintf_lock)

void
printf_init(void)
{
        /*
         * Lock is only really needed after the first thread is created.
         */
        simple_lock_init(&printf_lock, ETAP_MISC_PRINTF);
        mutex_init(&sprintf_lock, ETAP_MISC_PRINTF);
}

/* derived from boot_gets */
void
safe_gets(
        char    *str,
        int     maxlen)
{
        register char *lp;
        register int c;
        char *strmax = str + maxlen - 1; /* allow space for trailing 0 */

        lp = str;
        for (;;) {
                c = cngetc();
                switch (c) {
                case '\n':
                case '\r':
                        printf("\n");
                        *lp++ = 0;
                        return;
                        
                case '\b':
                case '#':
                case '\177':
                        if (lp > str) {
                                printf("\b \b");
                                lp--;
                        }
                        continue;

                case '@':
                case 'u'&037:
                        lp = str;
                        printf("\n\r");
                        continue;

                default:
                        if (c >= ' ' && c < '\177') {
                                if (lp < strmax) {
                                        *lp++ = c;
                                        printf("%c", c);
                                }
                                else {
                                        printf("%c", '\007'); /* beep */
                                }
                        }
                }
        }
}

void
conslog_putc(
        char c)
{
        extern unsigned int debug_mode, disableDebugOuput, disableConsoleOutput;

        if ((debug_mode && !disableDebugOuput) || !disableConsoleOutput)
                cnputc(c);

#ifdef  MACH_BSD
        log_putc(c);
#endif
}

void
printf(const char *fmt, ...)
{
        va_list listp;

        disable_preemption();
        va_start(listp, fmt);
        _doprnt(fmt, &listp, conslog_putc, 16);
        va_end(listp);
        enable_preemption();
}

static char *copybyte_str;

static void
copybyte(
        char byte)
{
  *copybyte_str++ = byte;
  *copybyte_str = '\0';
}

int
sprintf(char *buf, const char *fmt, ...)
{
        va_list listp;

        va_start(listp, fmt);
        mutex_lock(&sprintf_lock);
        copybyte_str = buf;
        _doprnt(fmt, &listp, copybyte, 16);
        mutex_unlock(&sprintf_lock);
        va_end(listp);
        return strlen(buf);
}